seq_serial.c

一个很好的c++ midi解码算法,不依赖于任何平台.

/*
 *  seq_serial.cc
 *  Copyright (C) 1998-2000 SAKAI Katsuya
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stdio.h>  // #include <iostream.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <termios.h>

#include "defines.h"
#include "config.h"
#include "seq_serial.h"
#include "extern.h"

int Sequencer_Serial::open(char *seqdev, int buflen)
{
  opt.useSerial=TRUE;
  if(flagOpen == TRUE) return -1;
  if((seqfd = ::open(seqdev, O_RDWR|O_NDELAY))<0)
    {
      perror("cannot open device");
      return -2;
    }
  _seqbuf = new u_char [buflen];
  if(!_seqbuf)
    {
      printf("allocation error\n"); // cerr << "allocation error" << endl;
      return -3;
    }
  _seqbuflen = buflen;
  _seqbufptr = 0;
  struct termios tio;
  if (tcgetattr (seqfd, &tio) < 0)
    {
      return -1;
    }
  tio_orig = tio;
  tio.c_iflag = 0;
  tio.c_oflag = 0;
  tio.c_cflag = CS8 | CREAD | CLOCAL | CRTSCTS;
  tio.c_lflag = 0;
  cfsetispeed(&tio, B38400);
  cfsetospeed(&tio, B38400);
  if (tcsetattr (seqfd, TCSANOW, &tio) < 0)
    {
      perror(" ");
      return -3;
    }
  flagOpen = TRUE;
  return 0;
}

int Sequencer_Serial::close(){
  if(flagOpen != TRUE) return -1;
  stopTimer();
  delete [] _seqbuf;
  flagOpen = FALSE;
  if (tcsetattr (seqfd, TCSANOW, &tio_orig) < 0)
    perror(" ");
  ::close(seqfd);
  return 0;
}

int Sequencer_Serial::checkMidiDevice()
{
  numberOfDevice = 1;
  return numberOfDevice;
}

void Sequencer_Serial::reset()
{
  seqbuf_dump();
  _seqbufptr = 0;
}

void Sequencer_Serial::sync()
{
  seqbuf_dump();
}

void Sequencer_Serial::startTimer()
{
#ifdef RUNNING_ST
  for(int n=0;n<16;n++) clearStatus(n);
#endif
  LastOutputPort = 0;
  gettimeofday(&starttime, NULL);
  ctrlrate = 1000000;
  LastTick = 0;
  CurrentTime = 0.;  
}

void Sequencer_Serial::stopTimer()
{
  changePort (port2dev[0], 0);
  LastOutputPort = 0;
  seqbuf_dump();
}

void Sequencer_Serial::seq_midiout(u_char dev, u_char dat)
{
  if (_seqbufptr>=_seqbuflen) seqbuf_dump();
  _seqbuf[_seqbufptr] = dat;
  _seqbufptr++;
}

void Sequencer_Serial::seq_waittime(u_long tick)
{
  static long waittime;
  seqbuf_dump();
  gettimeofday (&now, NULL);
  waittime = (long)tick - (now.tv_usec-starttime.tv_usec)
    - (now.tv_sec-starttime.tv_sec)*1000000;
  if(waittime>999)
    usleep (waittime);
}